Siemens 3RU21264DB1 Relay

Siemens 3RU21264DB1 is a thermal overload relay that provides dedicated motor protection in industrial control circuits. It carries a 20–25 A main circuit rating and is specified as a size S0, Class 10 (S0) device intended for stand-alone installation; it uses screw terminals for both the main circuit and the auxiliary circuit, enabling straightforward wiring in compact panels. The unit offers manual or automatic reset, allowing operators to restart the protected circuit after an overload condition or to rely on an automatic restart scheme per system design. This overload relay is designed to interrupt current in a motor circuit when overload or stall conditions occur, helping prevent overheating and potential damage to motors. As part of Siemens’ 3RU series, the 3RU21264DB1 is commonly integrated into motor control panels and paired with compatible Siemens motor protection gear to deliver reliable, compact protection for small to mid-size industrial motors.